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Wu PX, Guo ZW, Lai RD, Li XX, Sun C, Zheng ST. Giant Polyoxoniobate-Based Inorganic Molecular Tweezers: Metal Recognitions, Ion-Exchange Interactions and Mechanism Studies. Angew Chem Int Ed Engl 2023; 62:e202217926. [PMID: 36484495 DOI: 10.1002/anie.202217926] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 12/08/2022] [Accepted: 12/08/2022] [Indexed: 12/14/2022]
Abstract
This work reports the interesting and unique cation-exchange behaviors of the first indium-bridged purely inorganic 3D framework based on high-nuclearity polyoxoniobates as building units. Each nanoscale polyoxoniobate features a fascinating near-icosahedral core-shell structure with six pairs of unique inorganic "molecular tweezers" that have changeable openings for binding different metal cations via ion-exchanges and exhibit unusual selective metal-uptake behaviors. Further, the material has high chemical stability so that can undergo single-crystal-to-single-crystal metal-exchange processes to produce a dozen new crystals with high crystallinity. Based on these crystals and time-dependent metal-exchange experiments, we can visually reveal the detailed metal-exchange interactions and mechanisms of the material at the atomic precision level. This work demonstrates a rare systematic and atomic-level study on the ion-exchange properties of nanoclusters, which is of significance for the exploration of cluster-based ion-exchange materials that are still to be developed.
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Affiliation(s)
- Ping-Xin Wu
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated-Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Zheng-Wei Guo
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated-Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Rong-Da Lai
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated-Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Xin-Xiong Li
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated-Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Cai Sun
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated-Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Shou-Tian Zheng
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated-Materials, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
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2
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Zhang G, Wang F, Tubul T, Baranov M, Leffler N, Neyman A, Poblet JM, Weinstock IA. Complexed Semiconductor Cores Activate Hexaniobate Ligands as Nucleophilic Sites for Solar‐Light Reduction of CO
2
by Water. Angew Chem Int Ed Engl 2022; 61:e202213162. [PMID: 36200676 PMCID: PMC10098893 DOI: 10.1002/anie.202213162] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Indexed: 11/06/2022]
Abstract
Although pure and functionalized solid-state polyniobates such as layered perovskites and niobate nanosheets are photocatalysts for renewable-energy processes, analogous reactions by molecular polyoxoniobate cluster-anions are nearly absent from the literature. We now report that under simulated solar light, hexaniobate cluster-anion encapsulated 30-NiII -ion "fragments" of surface-protonated cubic-phase-like NiO cores activate the hexaniobate ligands towards CO2 reduction by water. Photoexcitation of the NiO cores promotes charge-transfer reduction of NbV to NbIV , increasing electron density at bridging oxo atoms of Nb-μ-O-Nb linkages that bind and convert CO2 to CO. Photogenerated NiO "holes" simultaneously oxidize water to dioxygen. The findings point to molecular complexation of suitable semiconductor "fragments" as a general method for utilizing electron-dense polyoxoniobate anions as nucleophilic photocatalysts for solar-light driven activation and reduction of small molecules.
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Affiliation(s)
- Guanyun Zhang
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & TechnologyBen-Gurion University of the NegevBeer Sheva84105Israel
- Key Lab for Colloid and Interface Science of Ministry of EducationSchool of Chemistry and Chemical EngineeringShandong UniversityJinan250100China
| | - Fei Wang
- Departament de Química Física i InorgànicaUniversitat Rovira i Virgili43007TarragonaSpain
| | - Tal Tubul
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & TechnologyBen-Gurion University of the NegevBeer Sheva84105Israel
| | - Mark Baranov
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & TechnologyBen-Gurion University of the NegevBeer Sheva84105Israel
| | - Nitai Leffler
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & TechnologyBen-Gurion University of the NegevBeer Sheva84105Israel
| | - Alevtina Neyman
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & TechnologyBen-Gurion University of the NegevBeer Sheva84105Israel
| | - Josep M. Poblet
- Departament de Química Física i InorgànicaUniversitat Rovira i Virgili43007TarragonaSpain
| | - Ira A. Weinstock
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & TechnologyBen-Gurion University of the NegevBeer Sheva84105Israel
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3
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Petrus E, Segado-Centellas M, Bo C. Computational Prediction of Speciation Diagrams and Nucleation Mechanisms: Molecular Vanadium, Niobium, and Tantalum Oxide Nanoclusters in Solution. Inorg Chem 2022; 61:13708-13718. [PMID: 35998382 DOI: 10.1021/acs.inorgchem.2c00925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Understanding the aqueous speciation of molecular metal-oxo-clusters plays a key role in different fields such as catalysis, electrochemistry, nuclear waste recycling, and biochemistry. To describe the speciation accurately, it is essential to elucidate the underlying self-assembly processes. Herein, we apply a computational method to predict the speciation and formation mechanisms of polyoxovanadates, -niobates, and -tantalates. While polyoxovanadates have been widely studied, polyoxoniobates and -tantalates lack the same level of understanding. First, we propose a pentavanadate cluster ([V5O14]3-) as a key intermediate for the formation of the decavanadate. Our computed phase speciation diagram is in particularly good agreement with the experiments. Second, we report the formation constants of the heptaniobate, [Nb7O22]9-, decaniobate, [Nb10O28]6-, and tetracosaniobate [H9Nb24O72]15-. Additionally, we compute the speciation and phase diagram of niobium, which so far was restricted to Lindqvist derivates. Finally, we predict the formation constant of the decatantalate ([Ta10O26]6-) in water, even though it had only been synthesized in toluene. Furthermore, we also calculate the corresponding speciation and phase diagrams for polyoxotantalates. Overall, we show that our method can be successfully applied to different families of molecular metal oxides without any need for readjustments; therefore, it can be regarded as a trustworthy tool for exploring polyoxometalates' chemistry.
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Affiliation(s)
- Enric Petrus
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans, 16, 43007 Tarragona, Spain.,Departament de Química Física i Inorgánica, Universitat Rovira i Virgili, Marcel•lí Domingo s/n, 43007 Tarragona, Spain
| | - Mireia Segado-Centellas
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans, 16, 43007 Tarragona, Spain
| | - Carles Bo
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans, 16, 43007 Tarragona, Spain.,Departament de Química Física i Inorgánica, Universitat Rovira i Virgili, Marcel•lí Domingo s/n, 43007 Tarragona, Spain
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4
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Sun L, Zhang X, Wang L, Yu H, Meng F, Qi T, Peng Y. Separation and extraction of niobium from H2SO4 solution containing titanium and iron impurities. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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5
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Steffler F, Haiduke RLA. Successive protonation of Lindqvist Hexaniobate, [Nb 6O 19] 8-: electronic properties and structural distortions. Phys Chem Chem Phys 2022; 24:13083-13093. [DOI: 10.1039/d2cp00607c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lindqvist Hexaniobate, [Nb6O19]8-, is an intriguing type of polyoxoniobate presenting a significant negative charge, high symmetry, robust structure and applications in photocatalysis. In this work, the [Nb6O19]8- polyanion was submitted...
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Zhang G, Baranov M, Wang F, Poblet JM, Kozuch S, Leffler N, Shames AI, Clemente-Juan JM, Neyman A, Weinstock IA. Soluble Complexes of Cobalt Oxide Fragments Bring the Unique CO 2 Photoreduction Activity of a Bulk Material into the Flexible Domain of Molecular Science. J Am Chem Soc 2021; 143:20769-20778. [PMID: 34854676 DOI: 10.1021/jacs.1c08817] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The deposition of metal oxides is essential to the fabrication of numerous multicomponent solid-state devices and catalysts. However, the reproducible formation of homogeneous metal oxide films or of nanoparticle dispersions at solid interfaces remains an ongoing challenge. Here we report that molecular hexaniobate cluster anion complexes of structurally and electronically distinct fragments of cubic-spinel and monoclinic Co3O4 can serve as tractable yet well-defined functional analogues of bulk cobalt oxide. Notably, the energies of the highest-occupied and lowest-unoccupied molecular orbitals (HOMO and LUMO) of the molecular complexes, 1, closely match the valence- and conduction-band (VB and CB) energies of the parent bulk oxides. Use of 1 as a molecular analogue of the parent oxides is demonstrated by its remarkably simple deployment as a cocatalyst for direct Z-scheme reduction of CO2 by solar light and water. Namely, evaporation of an aqueous solution of 1 on TiO2-coated fluorinated tin oxide windows (TiO2/FTO), immersion in wet acetonitrile, and irradiation by simulated solar light under an atmosphere of CO2 give H2, CO, and CH4 in ratios nearly identical to those obtained using 20 nm spinel-Co3O4 nanocrystals, but 15 times more rapidly on a Co basis and more rapidly overall than other reported systems. Detailed investigation of the photocatalytic properties of 1 on TiO2/FTO includes confirmation of a direct Z-scheme charge-carrier migration pathway by in situ irradiated X-ray photoelectron spectroscopy. More generally, the findings point to a potentially important new role for coordination chemistry that bridges the conceptual divide between molecular and solid-state science.
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Affiliation(s)
- Guanyun Zhang
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Mark Baranov
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Fei Wang
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, 43007 Tarragona, Spain
| | - Josep M Poblet
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, 43007 Tarragona, Spain
| | - Sebastian Kozuch
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Nitai Leffler
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Alexander I Shames
- Department of Physics, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Juan M Clemente-Juan
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, 46980 Paterna, Spain
| | - Alevtina Neyman
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
| | - Ira A Weinstock
- Department of Chemistry and the Ilse Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel
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7
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Steffler F, Haiduke RL. Investigating the electronic excitations in Polyoxoniobates: (Nb6O19)8−, (Nb10O28)6− and (XNb12O40)Y with (X=As, P, Si, Ge) and (Y=15− and 16−). J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.131156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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8
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Mangold L, Halleux H, Leclerc S, Moncomble A, Cote G, Chagnes A. New insights for titanium(iv) speciation in acidic media based on UV-visible and 31P NMR spectroscopies and molecular modeling. RSC Adv 2021; 11:27059-27073. [PMID: 35480018 PMCID: PMC9037697 DOI: 10.1039/d1ra04284j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 07/30/2021] [Indexed: 11/21/2022] Open
Abstract
Titanium chemistry in aqueous acidic media has been extensively investigated over the last decades. Hydrolyzed species such as Ti(OH)3+, TiO2+, Ti(OH)22+ or Ti(OH)3+ have been identified and their equilibria have been studied in nitric and perchloric acid. A predominance of the divalent cations was found for low pH (i.e., pH <2). Nonetheless, recent literature reports the existence of small titanium oxo-clusters in aqueous acidic media for large titanium(iv) concentration (typically., >0.1 mol L−1), as stable precursors for the formation of condensed titanium dioxide. The present paper reconsiders firstly previous knowledge about the speciation of titanium(iv) in non-complexing acidic media by giving evidence for the presence of polynuclear hydrolyzed species, even at very low Ti(iv) concentration (i.e., typically <0.1 mmol L−1). UV-visible absorbance spectra recorded for diluted nitric acid solutions (a model of non-complexing acidic medium) containing titanium(iv) were compared to time-dependent density functional theory (TD-DFT) predicted excitation energies. Experimental and predicted maximal absorbance wavelengths showed significantly improved matches when polynuclear species were considered in TD-DFT calculation. Then, 0.1–12.7 mol L−1 phosphoric acid solutions containing titanium(iv) were studied by means of spectroscopic techniques (UV-visible, NMR) in order to identify qualitatively the presence of titanium(iv) complexes and to link this speciation to the acid concentration. Two different titanium(iv) orthophosphate complexes, potentially polynuclear, were detected, and the presence of free titanium(iv) is also expected for low phosphoric acid concentration (i.e., <0.1 mol L−1). A general complexation scheme for a large range of H3PO4 concentration was thus formulated. A spectroscopic study of titanium(iv) speciation in diluted nitric acid (model of non-complexing medium) and 0.1–12.7 mol L−1 phosphoric acid aqueous solutions. Evidence for the presence of polynuclear species is supported by molecular modeling.![]()
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Affiliation(s)
- Lucas Mangold
- Université de Lorraine, CNRS, GeoRessources F-54000 Nancy France .,Prayon Rue Joseph Wauters 144 à B-4480 Engis Belgium
| | | | | | - Aurélien Moncomble
- Univ. Lille, CNRS, UMR 8516, LASIRE-Laboratoire Avancé de Spectroscopie pour Les Interactions La Réactivité et L'Environnement F-59000 Lille France
| | - Gérard Cote
- PSL Research University, Chimie ParisTech, CNRS, Institut de Recherche de Chimie-Paris (IRCP) F-75005 Paris France
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9
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Deblonde GJP. Spectrophotometric methods to probe the solution chemistry of lanthanide complexes with macromolecules. Methods Enzymol 2021; 651:1-22. [PMID: 33888200 DOI: 10.1016/bs.mie.2020.12.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Lanthanide biochemistry has experienced a revival in recent years owing to the discovery of new biomolecular platforms that are amenable to bind, sequester, or transport lanthanide ions. This has inherently created a need for physicochemical methods that report on lanthanide-containing macromolecular systems. In this chapter, the use of spectrophotometric methods to study the stability of lanthanide-macromolecule complexes in solution is discussed. Indeed, lanthanide ions have unique spectral properties in the ultraviolet, visible, and near-infrared domains that set them apart from the more common elements encountered in biochemistry, and these unique features can be leveraged to study, in a quantitative and robust manner, the solution chemistry of their biorelevant species (Kd, pH stability, temperature profile, etc.). This chapter aims at bringing a method that has been established and validated in the small molecule chemistry field to this new era of lanthanide biochemistry.
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Affiliation(s)
- Gauthier J-P Deblonde
- Glenn T. Seaborg Institute, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, United States.
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10
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Saeed A, Altarawneh M, Siddique K, Conesa JA, Ortuño N, Dlugogorski BZ. Photodecomposition properties of brominated flame retardants (BFRs). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 192:110272. [PMID: 32061989 DOI: 10.1016/j.ecoenv.2020.110272] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 01/25/2020] [Accepted: 01/30/2020] [Indexed: 06/10/2023]
Abstract
This study investigates the geometric and electronic properties of selected BFRs in their ground (S0) and first singlet excited (S1) states deploying methods of the density functional theory (DFT) and the time-dependent density functional theory (TDDFT). We estimate the effect of the S0→ S1 transition on the elongations of the C-Br bond, identify the frontier molecular orbitals involved in the excitation process and compute partial atomic charges for the most photoreactive bromine atoms. The bromine atom attached to an ortho position in HBB (with regard to C-C bond; 2,2',4,4',6,6'-hexabromobiphenyl), TBBA (with respect to the hydroxyl group; 2,2',6,6'-tetrabromobisphenol A), HBDE and BTBPE (in reference to C-O linkage; 2,2',4,4',6,6'-hexabromodiphenylether and 1,2-bis(2,4,6-tribromophenoxy)ethane, respectively) bears the highest positive atomic charge. This suggests that, these positions undergo reductive debromination reactions to produce lower brominated molecules. Debromination reactions ensue primarily in the aromatic compounds substituted with the highest number of bromine atoms owing to the largest stretching of the C-Br bond in the first excited state. The analysis of the frontier molecular orbitals indicates that, excitations of BFRs proceed via π→π*, or π→σ* or n→σ* electronic transitions. The orbital analysis reveals that, the HOMO-LUMO energy gap (EH-L) for all investigated bromine-substituted aromatic molecules falls lower (1.85-4.91 eV) than for their non-brominated analogues (3.39-8.07 eV), in both aqueous and gaseous media. The excitation energies correlate with the EH-L values. The excitation energies and EH-L values display a linear negative correlation with the number of bromine atoms attached to the molecule. Spectral analysis of the gaseous-phase systems reveals that, the highly brominated aromatics endure lower excitation energies and exhibit red shifts of their absorption bands in comparison to their lower brominated congeners. We attained a satisfactory agreement between the experimentally measured absorption peak (λmax) and the theoretically predicted oscillator strength (λmax) for the UV-Vis spectra. This study further confirms that, halogenated aromatics only absorb light in the UV spectral region and that effective photodegradation of these pollutants requires the presence of photocatalysts.
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Affiliation(s)
- Anam Saeed
- School of Engineering and Information Technology, Murdoch University, 90 South Street, Murdoch, WA, 6150, Australia
| | - Mohammednoor Altarawneh
- United Arab Emirates University, Department of Chemical and Petroleum Engineering, Sheikh Khalifa bin Zayed Street, Al-Ain, 15551, United Arab Emirates.
| | - Kamal Siddique
- School of Engineering and Information Technology, Murdoch University, 90 South Street, Murdoch, WA, 6150, Australia
| | - Juan A Conesa
- Departamento de Ingeniería Química, Facultad de Ciencias, Universidad de Alicante Apartado 99, 03080, Alicante, Spain
| | - Nuria Ortuño
- Departamento de Ingeniería Química, Facultad de Ciencias, Universidad de Alicante Apartado 99, 03080, Alicante, Spain
| | - Bogdan Z Dlugogorski
- Charles Darwin University, Office of Deputy Vice-Chancellor, Research & Innovation, Darwin, Northern Territory, 0909, Australia
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11
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Dopta J, Mahnke LK, Bensch W. New pronounced progress in the synthesis of group 5 polyoxometalates. CrystEngComm 2020. [DOI: 10.1039/d0ce00315h] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
This highlight summarizes new developments made in group 5 polyoxometalate science of high nuclearity clusters with focus on synthetic approaches.
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Affiliation(s)
- Joanna Dopta
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität zu Kiel
- 24118 Kiel
- Germany
| | - Lisa K. Mahnke
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität zu Kiel
- 24118 Kiel
- Germany
| | - Wolfgang Bensch
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität zu Kiel
- 24118 Kiel
- Germany
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12
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Deblonde GJP, Bengio D, Beltrami D, Bélair S, Cote G, Chagnes A. A fluoride-free liquid-liquid extraction process for the recovery and separation of niobium and tantalum from alkaline leach solutions. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.01.052] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Ma J, Qin G, Wei W, Xiao T, Liu S, Jiang L. Anti-corrosion porous RuO2/NbC anodes for the electrochemical oxidation of phenol. RSC Adv 2019; 9:17373-17381. [PMID: 35519841 PMCID: PMC9064596 DOI: 10.1039/c9ra03353j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Accepted: 05/25/2019] [Indexed: 11/21/2022] Open
Abstract
Efficient anode materials with porous structures have drawn increasing attention due to their high specific surface area, which can compensate for the slow reaction rate of electrochemical oxidation. However, the use of these materials is often limited due to their poor corrosion resistance. Herein, we report a facile scale-up method, by carbothermal reduction, for the preparation of porous niobium carbide to be used as an anode for the electrochemical oxidation of phenol in water. No niobium ions were detected when the anodes were under aggressive attack by sulfuric acid and under electrochemical corrosion tests with a current density less than 20.98 mA cm−2. The porous niobium carbide was further modified by applying a ruthenium oxide coating to improve its catalytic activity. The removal rates of phenol and chemical oxygen demand by the RuO2/NbC anode reached 1.87 × 10−2 mg min−1 cm−2 and 6.33 × 10−2 mg min−1 cm−2, respectively. The average current efficiency was 85.2%. Thus, an anti-corrosion, highly catalytically active and energy-efficient porous RuO2/NbC anode for the degradation of aqueous phenol in wastewater was successfully prepared. Efficient anode materials with porous structures have drawn increasing attention due to their high specific surface area, which can compensate for the slow reaction rate of electrochemical oxidation.![]()
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Affiliation(s)
- Jing Ma
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education
- Beihang University
- Shahe Campus
- Beijing 102206
- China
| | - Guotong Qin
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education
- Beihang University
- Shahe Campus
- Beijing 102206
- China
| | - Wei Wei
- College of Biochemical Engineering
- Beijing Union University
- Beijing 100023
- China
| | - Tianliang Xiao
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education
- Beihang University
- Shahe Campus
- Beijing 102206
- China
| | - Shaomin Liu
- Department of Chemical Engineering
- Curtin University
- Perth
- Australia
| | - Lei Jiang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education
- Beihang University
- Shahe Campus
- Beijing 102206
- China
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14
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Sures DJ, Nagabhushana GP, Navrotsky A, Nyman M. Thermochemical Measurements of Alkali Cation Association to Hexatantalate. Molecules 2018; 23:molecules23102441. [PMID: 30250000 PMCID: PMC6222682 DOI: 10.3390/molecules23102441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 09/18/2018] [Accepted: 09/19/2018] [Indexed: 11/17/2022] Open
Abstract
Ion association is an important process in aqueous dissolution, precipitation, and crystallization of ionic inorganic, organic, and biological materials. Polyoxometalates (POMs) are good model compounds for understanding the complex relationships between lattice energy, ion-pairing in solution, and salt solubility. Here we perform calorimetric measurements to elucidate trends in cluster stability, lattice energy, and ion-pairing behavior studies of simple hexatantalate salts in neat water, parent hydroxide solutions, and molybdate melts, extending previous studies on the isostructural hexaniobates. High temperature calorimetry of alkali salts of hexatantalate reveals that the enthalpies of formation from oxides of the K, Rb, and Cs salts are more similar to each other than they are for their niobate analogues and that the tantalate cluster is energetically less stable than hexaniobate. Aqueous dissolution calorimetry reveals that the cesium salt of hexatantalate has a similar concentration dependence on its dissolution enthalpy to that of hexaniobate. However, unlike rubidium hexaniobate, rubidium hexatantalate also exhibits increased concentration dependence, indicating that hextantalate can undergo increased ion-pairing with alkali salts other than cesium, despite the dilute environments studied. Dissolution enthalpies of POM salts in the parent alkali hydroxides shows that protonation of clusters stabilizes lattices even more than the strongly associating heavy alkali cations do. Additionally, neither weak nor strong lattice ion associations necessarily correlates with respectively high or low aqueous solubility. These studies illuminate the importance of considering ion-pairing among the interrelated processes in the aqueous dissolution of ionic salts that can be extended to serving as a model of cation association to metal oxide surfaces.
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Affiliation(s)
- Dylan J Sures
- Department of Chemistry, Oregon State University, Corvallis, OR 97331-4003, USA.
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA.
| | - G P Nagabhushana
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California Davis, Davis, CA 95616, USA.
| | - Alexandra Navrotsky
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California Davis, Davis, CA 95616, USA.
| | - May Nyman
- Department of Chemistry, Oregon State University, Corvallis, OR 97331-4003, USA.
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15
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De Cock B, Delaunay N, Deblonde G, Bosi V, Pasti L, Mangelings D, Vander Heyden Y. Kinetic study of niobium and tantalum hexameric forms and their substituted ions by capillary electrophoresis in alkaline medium. Talanta 2017; 175:127-134. [PMID: 28841969 DOI: 10.1016/j.talanta.2017.07.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 07/04/2017] [Accepted: 07/10/2017] [Indexed: 11/30/2022]
Abstract
In this work a capillary electrophoretic (CE) method is used for the kinetic study of the intermetallic substitutions in hexameric ions of two strategic metals, tantalum and niobium in an alkaline medium. Recently proposed processes for the production and analytical separation of tantalum and niobium that are faster, more economical and environmental friendly are based on the use of highly alkaline media. It was previously established that in these media, tantalum and niobium exist as hexameric species, HxTa6O19X-8 (Ta6) and HxNb6019x-8 (Nb6), which can be analysed with a CE method using an alkaline electrolyte and UV detection. However, when using the above method on an industrial sample a minor species that should correspond to the substituted Ta1Nb5 form was observed. The purpose of the present study is to probe, by means of CE, the kinetic of the formation of substituted niobate-tantalate ions, Ta6-xNbx (1 ≤ x ≤ 5), starting from mixtures of pure hexaniobate and hexatantalate ions. This study required the development of a new CE method allowing the separation of all the five substituted ions and their two non-substituted hexameric parent ions in less than seven minutes. In details, a previously developed separation method was transferred to a Beckman instrument and the separation improved by adjusting the total length, the applied voltage, the injection volume, the rinsing steps and the internal standard. The kinetic study shows that samples initially containing non-substituted hexameric forms of tantalum and niobium in a 1:1M ratio naturally form the five possible substituted species Ta6-xNbx (1 ≤ x ≤ 5) after only a few hours which may represent an issue for future Nb-Ta separation processes operated in alkaline media. The developed method was also transferred to an Agilent instrument and the kinetic study repeated. Results obtained with the Agilent instrument corroborate those obtained with the Beckman instrument. The proposed electrophoretic separation method lays the ground for new analytical techniques that could help assessing the presence of substituted species that can be deleterious for Nb-Ta purification processes.
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Affiliation(s)
- Bart De Cock
- Department of Analytical Chemistry and Pharmaceutical Technology, Center for Pharmaceutical Research, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090 Brussels, Belgium
| | - Nathalie Delaunay
- Laboratoire Sciences Analytiques, Bioanalytiques et Miniaturisation (LSABM), UMR CBI 8231, ESPCI Paris, PSL Research University, 10 Rue Vauquelin, F-75005 Paris, France; CNRS, UMR CBI 8231 Paris, France
| | - Gauthier Deblonde
- Laboratoire Sciences Analytiques, Bioanalytiques et Miniaturisation (LSABM), UMR CBI 8231, ESPCI Paris, PSL Research University, 10 Rue Vauquelin, F-75005 Paris, France
| | - Valentina Bosi
- Department of Chemistry and Pharmaceutical Sciences, University of Ferrara, 9 Via Savonarola, 44121 FE, Ferrara, Italy
| | - Luisa Pasti
- Department of Chemistry and Pharmaceutical Sciences, University of Ferrara, 9 Via Savonarola, 44121 FE, Ferrara, Italy
| | - Debby Mangelings
- Department of Analytical Chemistry and Pharmaceutical Technology, Center for Pharmaceutical Research, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090 Brussels, Belgium
| | - Yvan Vander Heyden
- Department of Analytical Chemistry and Pharmaceutical Technology, Center for Pharmaceutical Research, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, B-1090 Brussels, Belgium.
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16
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De Cock B, Oliver JD, Delaunay N, Deblonde G, Mangelings D, Vander Heyden Y. Interinstrumental transfer of a fast short-end injection capillary electrophoresis method: Application to the separation of niobium, tantalum, and their substituted ions. Electrophoresis 2017; 38:2069-2074. [PMID: 28444765 DOI: 10.1002/elps.201700094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 04/13/2017] [Accepted: 04/14/2017] [Indexed: 11/08/2022]
Abstract
The interinstrumental transfer of a short-end CE method was studied. A model separation of the hexameric forms of niobium, tantalum, and their substituted ions (Nb6-x Tax with 0 ≤ x ≤ 6) was selected as test case. The method was first optimized on a Beckman instrument and in a second step transferred to an Agilent instrument. The transfer needed updated guidelines that tackled differences in effective capillary length, 8.5 (Agilent) versus 10 cm (Beckman), because of instrumental different capillary cartridges. Differences in effective length lead to migration time and separation efficiency inequalities, illustrated by a decrease in resolution between the substituted ions. The difference in effective length was overcome by adapting the lift offset parameter of the Agilent instrument. The lift offset default setting is 4 mm and by increasing this parameter both the inlet and outlet lifts are lowered and thus the detection window can be displaced and consequently the effective length was increased. The decrease in effective length difference and the effect on the separation efficiency was investigated and led finally to a restored separation of the substituted ions. The adaptation of the lift offset parameter during short-end injection methods was added to earlier developed guidelines to facilitate interinstrumental method transfer of CE methods.
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Affiliation(s)
- Bart De Cock
- Department of Analytical Chemistry and Pharmaceutical Technology, Center for Pharmaceutical Research, Vrije Universiteit Brussel (VUB), Brussels, Belgium.,Laboratoire Sciences Analytiques, Bioanalytiques et Miniaturisation (LSABM), UMR CBI 8231, ESPCI Paris, PSL Research University, Paris, France
| | - James D Oliver
- Laboratoire Sciences Analytiques, Bioanalytiques et Miniaturisation (LSABM), UMR CBI 8231, ESPCI Paris, PSL Research University, Paris, France
| | - Nathalie Delaunay
- Laboratoire Sciences Analytiques, Bioanalytiques et Miniaturisation (LSABM), UMR CBI 8231, ESPCI Paris, PSL Research University, Paris, France.,CNRS, UMR CBI 8231, Paris, France
| | - Gauthier Deblonde
- Laboratoire Sciences Analytiques, Bioanalytiques et Miniaturisation (LSABM), UMR CBI 8231, ESPCI Paris, PSL Research University, Paris, France
| | - Debby Mangelings
- Department of Analytical Chemistry and Pharmaceutical Technology, Center for Pharmaceutical Research, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Yvan Vander Heyden
- Department of Analytical Chemistry and Pharmaceutical Technology, Center for Pharmaceutical Research, Vrije Universiteit Brussel (VUB), Brussels, Belgium
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17
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Parrot A, Bernard A, Jacquart A, Serapian SA, Bo C, Derat E, Oms O, Dolbecq A, Proust A, Métivier R, Mialane P, Izzet G. Photochromism and Dual-Color Fluorescence in a Polyoxometalate-Benzospiropyran Molecular Switch. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701860] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Arnaud Parrot
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232; Sorbonne Universités, UPMC-Paris06; 4 Place Jussieu, F- 75005 Paris France
| | - Aurélie Bernard
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232; Sorbonne Universités, UPMC-Paris06; 4 Place Jussieu, F- 75005 Paris France
| | - Aurélie Jacquart
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232; Sorbonne Universités, UPMC-Paris06; 4 Place Jussieu, F- 75005 Paris France
| | - Stefano Artin Serapian
- Catalan Institute of Chemical Research (ICIQ); The Barcelona Institute of Science and Technology; Avinguda dels Països Catalans 16 43007 Tarragona Spain
| | - Carles Bo
- Catalan Institute of Chemical Research (ICIQ); The Barcelona Institute of Science and Technology; Avinguda dels Països Catalans 16 43007 Tarragona Spain
- Department de Química Física i Inorgànica; Universitat Rovira i Virgili, Avda. Marcel.li Domingo s/n.; Tarragona Spain
| | - Etienne Derat
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232; Sorbonne Universités, UPMC-Paris06; 4 Place Jussieu, F- 75005 Paris France
| | - Olivier Oms
- Institut Lavoisier de Versailles, UMR CNRS 8180; Université de Versailles Saint-Quentin en Yvelines; Université Paris Saclay; 45 Avenue des Etats-Unis, F- 78035 Versailles cedex France
| | - Anne Dolbecq
- Institut Lavoisier de Versailles, UMR CNRS 8180; Université de Versailles Saint-Quentin en Yvelines; Université Paris Saclay; 45 Avenue des Etats-Unis, F- 78035 Versailles cedex France
| | - Anna Proust
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232; Sorbonne Universités, UPMC-Paris06; 4 Place Jussieu, F- 75005 Paris France
| | - Rémi Métivier
- PPSM, UMR CNRS 8531, ENS Cachan; 61 av. Président Wilson 94235 Cachan cedex France
| | - Pierre Mialane
- Institut Lavoisier de Versailles, UMR CNRS 8180; Université de Versailles Saint-Quentin en Yvelines; Université Paris Saclay; 45 Avenue des Etats-Unis, F- 78035 Versailles cedex France
| | - Guillaume Izzet
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232; Sorbonne Universités, UPMC-Paris06; 4 Place Jussieu, F- 75005 Paris France
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18
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Parrot A, Bernard A, Jacquart A, Serapian SA, Bo C, Derat E, Oms O, Dolbecq A, Proust A, Métivier R, Mialane P, Izzet G. Photochromism and Dual-Color Fluorescence in a Polyoxometalate-Benzospiropyran Molecular Switch. Angew Chem Int Ed Engl 2017; 56:4872-4876. [DOI: 10.1002/anie.201701860] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Arnaud Parrot
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232; Sorbonne Universités, UPMC-Paris06; 4 Place Jussieu, F- 75005 Paris France
| | - Aurélie Bernard
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232; Sorbonne Universités, UPMC-Paris06; 4 Place Jussieu, F- 75005 Paris France
| | - Aurélie Jacquart
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232; Sorbonne Universités, UPMC-Paris06; 4 Place Jussieu, F- 75005 Paris France
| | - Stefano Artin Serapian
- Catalan Institute of Chemical Research (ICIQ); The Barcelona Institute of Science and Technology; Avinguda dels Països Catalans 16 43007 Tarragona Spain
| | - Carles Bo
- Catalan Institute of Chemical Research (ICIQ); The Barcelona Institute of Science and Technology; Avinguda dels Països Catalans 16 43007 Tarragona Spain
- Department de Química Física i Inorgànica; Universitat Rovira i Virgili, Avda. Marcel.li Domingo s/n.; Tarragona Spain
| | - Etienne Derat
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232; Sorbonne Universités, UPMC-Paris06; 4 Place Jussieu, F- 75005 Paris France
| | - Olivier Oms
- Institut Lavoisier de Versailles, UMR CNRS 8180; Université de Versailles Saint-Quentin en Yvelines; Université Paris Saclay; 45 Avenue des Etats-Unis, F- 78035 Versailles cedex France
| | - Anne Dolbecq
- Institut Lavoisier de Versailles, UMR CNRS 8180; Université de Versailles Saint-Quentin en Yvelines; Université Paris Saclay; 45 Avenue des Etats-Unis, F- 78035 Versailles cedex France
| | - Anna Proust
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232; Sorbonne Universités, UPMC-Paris06; 4 Place Jussieu, F- 75005 Paris France
| | - Rémi Métivier
- PPSM, UMR CNRS 8531, ENS Cachan; 61 av. Président Wilson 94235 Cachan cedex France
| | - Pierre Mialane
- Institut Lavoisier de Versailles, UMR CNRS 8180; Université de Versailles Saint-Quentin en Yvelines; Université Paris Saclay; 45 Avenue des Etats-Unis, F- 78035 Versailles cedex France
| | - Guillaume Izzet
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232; Sorbonne Universités, UPMC-Paris06; 4 Place Jussieu, F- 75005 Paris France
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19
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Sures DJ, Serapian SA, Kozma K, Molina PI, Bo C, Nyman M. Electronic and relativistic contributions to ion-pairing in polyoxometalate model systems. Phys Chem Chem Phys 2017; 19:8715-8725. [DOI: 10.1039/c6cp08454k] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Experiment and theory delineate covalency, electrostatic association, and relativistic effect contributions to polyoxometalate-alkali ion-pairs in water.
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Affiliation(s)
- Dylan J. Sures
- Department of Chemistry
- Oregon State University
- Corvallis
- USA
| | - Stefano A. Serapian
- Institut Català d'Investigació Química (ICIQ)
- The Barcelona Institute of Science and Technology
- 17. 43007 Tarragona
- Spain
| | - Károly Kozma
- Department of Chemistry
- Oregon State University
- Corvallis
- USA
| | | | - Carles Bo
- Institut Català d'Investigació Química (ICIQ)
- The Barcelona Institute of Science and Technology
- 17. 43007 Tarragona
- Spain
| | - May Nyman
- Department of Chemistry
- Oregon State University
- Corvallis
- USA
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20
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Deblonde GJP, Chagnes A, Roux MA, Weigel V, Cote G. Extraction of Nb(v) by quaternary ammonium-based solvents: toward organic hexaniobate systems. Dalton Trans 2016; 45:19351-19360. [PMID: 27874897 DOI: 10.1039/c6dt03873e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Solvent extraction of Nb(v) from alkaline aqueous media using quaternary ammonium solutions, especially Aliquat® 336 diluted in an aliphatic diluent, was investigated. The hexaniobate ions (HxNb6O19x-8) were extracted into the organic phase with very high yields at room temperature and within a few minutes, affording easy access to organic solutions of hexaniobates. Several parameters were found to influence the extraction of HxNb6O19x-8 including the nature and concentration of alkali cations, confirming subtle effects previously described for polyoxoniobates such as ion-pairing with alkali ions. The extraction of HxNb6O19x-8 with Aliquat® 336 is also influenced if competing anions are present in the aqueous phase (NO3-, Cl-, C2O42-, SO42- and CO32-) and varies with the pH mainly due to the competitive extraction of hydroxide ions at high pH. The co-extraction of sodium ions with HxNb6O19x-8 was observed as well as the co-extraction of water molecules, suggesting a self-association of the extractant. The proposed liquid-liquid extraction generic system paves the way for innovative niobium (and potentially tantalum) hydrometallurgical processes and it may also afford more direct routes for exploring the chemistry of hexaniobates in organic solvents.
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Affiliation(s)
- Gauthier J-P Deblonde
- PSL Research University, Chimie ParisTech - CNRS, Institut de Recherche de Chimie Paris, 11 rue Pierre et Marie Curie, 75005 Paris, France. and Eramet Research, Hydrometallurgy department, F-78193 Trappes, France
| | - Alexandre Chagnes
- PSL Research University, Chimie ParisTech - CNRS, Institut de Recherche de Chimie Paris, 11 rue Pierre et Marie Curie, 75005 Paris, France. and University of Lorraine, GeoRessources Lab, UMR CNRS 7359, 2 Rue Doyen Marcel Roubault, TSA 70605, 54518 Vandoeuvre Les Nancy, France
| | - Marie-Aude Roux
- Eramet Research, Hydrometallurgy department, F-78193 Trappes, France
| | - Valérie Weigel
- Eramet Research, Hydrometallurgy department, F-78193 Trappes, France
| | - Gérard Cote
- PSL Research University, Chimie ParisTech - CNRS, Institut de Recherche de Chimie Paris, 11 rue Pierre et Marie Curie, 75005 Paris, France.
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21
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Sun S, Liu X, Yang L, Tan H, Wang E. Capillary Zone Electrophoresis as a Tool to Monitor the Stability and Hydrolytic Equilibria of Strandberg‐Type Polyoxometalates in Aqueous Solution. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600409] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Shucheng Sun
- Department of ChemistryNortheast Normal University5268 Renmin Street130024ChangchunJilin ProvinceP. R. China
| | - Xin Liu
- Department of ChemistryNortheast Normal University5268 Renmin Street130024ChangchunJilin ProvinceP. R. China
| | - Li Yang
- Department of ChemistryNortheast Normal University5268 Renmin Street130024ChangchunJilin ProvinceP. R. China
| | - Huaqiao Tan
- Key Laboratory of Polyoxometalate Science of Ministry of Education Faculty of ChemistryNortheast Normal University5268 Renmin Street130024ChangchunJilin ProvinceP. R. China
| | - EnBo Wang
- Key Laboratory of Polyoxometalate Science of Ministry of Education Faculty of ChemistryNortheast Normal University5268 Renmin Street130024ChangchunJilin ProvinceP. R. China
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22
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Deblonde GJP, Coelho-Diogo C, Chagnes A, Cote G, Smith ME, Hanna JV, Iuga D, Bonhomme C. Multinuclear Solid-State NMR Investigation of Hexaniobate and Hexatantalate Compounds. Inorg Chem 2016; 55:5946-56. [DOI: 10.1021/acs.inorgchem.6b00345] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gauthier J.-P. Deblonde
- PSL Research University, Chimie ParisTech-CNRS,
Institut de Recherche de Chimie Paris, 11 rue Pierre et Marie Curie, 75005 Paris, France
- ERAMET Research, Hydrometallurgy department, 1 avenue Albert Einstein, F-78193 Trappes, France
| | - Cristina Coelho-Diogo
- Institut des Matériaux de Paris Centre (IMPC-UPMC-FR2482), site collège de France, 75005 Paris, France
| | - Alexandre Chagnes
- PSL Research University, Chimie ParisTech-CNRS,
Institut de Recherche de Chimie Paris, 11 rue Pierre et Marie Curie, 75005 Paris, France
| | - Gérard Cote
- PSL Research University, Chimie ParisTech-CNRS,
Institut de Recherche de Chimie Paris, 11 rue Pierre et Marie Curie, 75005 Paris, France
| | - Mark E. Smith
- Vice-Chancellor’s
Office, University House, Lancaster University, Lancaster LA1 4YW, U.K
| | - John V. Hanna
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K
| | - Dinu Iuga
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K
| | - Christian Bonhomme
- Sorbonne Universités, UPMC Univ Paris 06,
UMR CNRS 7574, Laboratoire de Chimie de la Matière Condensée
de Paris, Collège de France, 11 place Marcelin Berthelot, 75005, Paris, France
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23
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Deblonde GJP, Weigel V, Bellier Q, Houdard R, Delvallée F, Bélair S, Beltrami D. Selective recovery of niobium and tantalum from low-grade concentrates using a simple and fluoride-free process. Sep Purif Technol 2016. [DOI: 10.1016/j.seppur.2016.02.025] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Development of a capillary electrophoresis method for the analysis in alkaline media as polyoxoanions of two strategic metals: Niobium and tantalum. J Chromatogr A 2016; 1437:210-218. [DOI: 10.1016/j.chroma.2016.01.075] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 01/26/2016] [Accepted: 01/27/2016] [Indexed: 11/17/2022]
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25
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Abramov PA, Zemerova TP, Moroz NK, Kompankov NB, Zhdanov AA, Tsygankova AR, Vicent C, Sokolov MN. Synthesis and Characterization of [(OH)TeNb5O18](6-) in Water Solution, Comparison with [Nb6O19](8-). Inorg Chem 2016; 55:1381-9. [PMID: 26845639 DOI: 10.1021/acs.inorgchem.5b01806] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reaction of [Nb6O19](8-) with H6TeO6 in water gives telluropentaniobate [(OH)TeNb5O18](6-) (1) as single product, which was isolated as Na(+) and mixed Na(+)/K(+) salts. Crystal structures were determined for Na6[(OH)TeNb5O18]·15H2O (Na6-1) and K6Na[Nb(5.5){Te(OH)}(0.5)O(18.5)]·26H2O (K6Na-1). Formation of 1 was monitored with electrospray ionization mass spectrometry (ESI-MS) and (125)Te NMR techniques. Capillary electrophoresis was used to calculate electrophoretic mobilities and radii of the anionic species in solutions of [(OH)TeNb5O18](6-) and [Nb6O19](8-) in borate buffer. No condensation or degradation products were detected. Reactions of 1 with {Cp*Rh}(2+) sources gives 1:1 and 2:1 hybrid polyoxometalate, which are present in solution as a mixture of isomers, as detected by (125)Te NMR. The isomerism is related to various possibilities of coordination of {Cp*Rh}(2+) to different {M3O3} faces, relative to the unique Te atom. According to ESI-MS experiments in water and methanol, rapid redistribution of the organometallic fragments between the 1:1 and 2:1 complexes takes place. The 1:1 complexes are more stable in water, while 2:1 complexes dominate in methanol. X-ray structural analysis of the crystals isolated from 2:1 reaction mixture allowed identification of Na3[{Cp*Rh}2TeNb5O19]·24H2O (Cp*2Rh2-1) with two {Cp*Rh}(2+) fragments capping the opposing faces of the Lindqvist anion.
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Affiliation(s)
- Pavel A Abramov
- Nikolaev Institute of Inorganic Chemistry SB RAS , Novosibirsk 630090, Russia.,Novosibirsk State University , Novosibirsk 630090, Russia
| | - Tatiana P Zemerova
- Nikolaev Institute of Inorganic Chemistry SB RAS , Novosibirsk 630090, Russia.,Novosibirsk State University , Novosibirsk 630090, Russia
| | - Nikolay K Moroz
- Nikolaev Institute of Inorganic Chemistry SB RAS , Novosibirsk 630090, Russia
| | - Nikolay B Kompankov
- Nikolaev Institute of Inorganic Chemistry SB RAS , Novosibirsk 630090, Russia
| | - Artem A Zhdanov
- Nikolaev Institute of Inorganic Chemistry SB RAS , Novosibirsk 630090, Russia
| | - Alfiya R Tsygankova
- Nikolaev Institute of Inorganic Chemistry SB RAS , Novosibirsk 630090, Russia
| | - Cristian Vicent
- Serveis Centrals d'Instrumentació Científica, Universitat Jaume I , Av. Sos Baynat s/n, 12071 Castelló, Spain
| | - Maxim N Sokolov
- Nikolaev Institute of Inorganic Chemistry SB RAS , Novosibirsk 630090, Russia.,Novosibirsk State University , Novosibirsk 630090, Russia
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26
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Sures DJ, Molina PI, Miró P, Zakharov LN, Nyman M. Cesium salts of niobo-tungstate isopolyanions with intermediate group V–group VI character. NEW J CHEM 2016. [DOI: 10.1039/c5nj02914g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The physical and electronic structures of cesium salts of niobo-tungstate Lindqvist ions vary with Nb content, elucidated experimentally and computationally.
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Affiliation(s)
- Dylan J. Sures
- Department of Chemistry
- Oregon State University
- Corvallis
- USA
| | | | - Pere Miró
- Department of Physics and Earth Sciences
- Theoretical Physics – Theoretical Material Science
- Jacobs University
- Bremen
- Germany
| | | | - May Nyman
- Department of Chemistry
- Oregon State University
- Corvallis
- USA
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27
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28
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Deblonde GJP, Delaunay N, Lee D, Chagnes A, Cote G, Gareil P. First investigation of polyoxoniobate and polyoxotantalate aqueous speciation by capillary zone electrophoresis. RSC Adv 2015. [DOI: 10.1039/c5ra11521c] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aqueous solutions of hexaniobate (HxNb6O19x−8, 0 ≤ x ≤ 3) and hexatantalate ions (HxTa6O19x−8, 0 ≤ x ≤ 3) have been probed by capillary zone electrophoresis (CE) for the first time.
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Affiliation(s)
- Gauthier J.-P. Deblonde
- PSL Research University
- Chimie ParisTech – CNRS
- Institut de Recherche de Chimie Paris
- 75005 Paris
- France
| | - Nathalie Delaunay
- PSL Research University
- ESPCI ParisTech
- Laboratory of Analytical and Bioanalytical Sciences and Miniaturization
- UMR CBI 8231
- 75231 Paris Cedex 05
| | - Dahye Lee
- PSL Research University
- ESPCI ParisTech
- Laboratory of Analytical and Bioanalytical Sciences and Miniaturization
- UMR CBI 8231
- 75231 Paris Cedex 05
| | - Alexandre Chagnes
- PSL Research University
- Chimie ParisTech – CNRS
- Institut de Recherche de Chimie Paris
- 75005 Paris
- France
| | - Gérard Cote
- PSL Research University
- Chimie ParisTech – CNRS
- Institut de Recherche de Chimie Paris
- 75005 Paris
- France
| | - Pierre Gareil
- PSL Research University
- ESPCI ParisTech
- Laboratory of Analytical and Bioanalytical Sciences and Miniaturization
- UMR CBI 8231
- 75231 Paris Cedex 05
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